content: Use stl utilities from the base namespace

content/browser/plugin_private_storage_helper.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/plugin_private_storage_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 377 matching lines @@
 
   if (origins.empty()) {
     // No origins, so nothing to do.
     callback.Run();
     return;
   }
 
   // If a specific origin is provided, then check that it is in the list
   // returned and remove all the other origins.
   if (!storage_origin.is_empty()) {
-    if (!ContainsKey(origins, storage_origin)) {
+    if (!base::ContainsKey(origins, storage_origin)) {
       // Nothing matches, so nothing to do.
       callback.Run();
       return;
     }
 
     // List should only contain the one value that matches.
     origins.clear();
     origins.insert(storage_origin);
   }
 
   PluginPrivateDataDeletionHelper* helper = new PluginPrivateDataDeletionHelper(
       std::move(filesystem_context), begin, end, callback);
   helper->CheckOriginsOnFileTaskRunner(origins);
   // |helper| will delete itself when all origins have been checked.
 }
 
 }  // namespace content